Golf club head and golf club

ABSTRACT

The present invention provides a golf club head and a golf club by which at least a lie angle, an offset of a striking surface, and the moment of inertia can be adjusted. This golf club head has: a head main body provided with a face surface part constituting a face surface; a hosel part which is provided in the head main body, and to which a golf club shaft is attached; adjustment weights provided on the head main body; a lie angle adjustment part for changing the lie angle; and an offset adjustment part for changing the distance between the face surface and the hosel part. The head main body is provided with a projecting part on the upper surface that projects outward in a half cylinder shape, and flat parts that are provided on both sides of the projecting part, and the hosel part is provided on the projecting part and the adjustment weights are respectively provided on the flat parts. The golf club has the golf club head.

TECHNICAL FIELD

The invention relates to a golf club head and a golf club for striking agolf ball on a green, and specifically relates to a golf club head and agolf club in which it is possible to adjust at least a lie angle, anoffset of a striking surface, and a moment of inertia.

BACKGROUND ART

In golf, a putter is used as a golf club for putting a golf ball into acup on a green.

As an ability required in the putter, high straight advancing ability ofthe golf ball when the golf ball is struck is required. This makes itpossible for a golfer, who is a user, to roll the golf ball such that atrajectory expected by the golfer is drawn.

For example, Patent Document 1 describes detachable weights suitablyused for adjusting the moment of inertia of a golf club head.

In addition, a body size, a muscular strength, etc. are different foreach golfer, and a lie angle and a loft angle required for each golferare different. For example, Patent Document 2 describes a golf putterhaving a variable lie angle. Patent Document 3 describes a putter forwhich a desired loft can be set.

CITATION LIST Patent Literature

Patent Document 1: JP2009-247911 A

Patent Document 2: JP2009-136638 A

Patent Document 3: JP2003-210629 A

SUMMARY OF INVENTION Technical Problem

As described above, in the prior art, one of a lie angle, a loft angle,and the moment of inertia of a putter can be adjusted, but it cannot besaid that a putter according to user requests can be obtained.

An objective of the invention is to provide a golf club head and a golfclub that solve the problem based on the above-described prior art, andthat make it possible to adjust at least a lie angle, an offset of astriking surface, and a moment of inertia.

Solution to Problem

In order to achieve the above-described object, the invention provides agolf club head, including a head main body including a face surface partconstituting a face surface, a hosel part provided in the head main bodyand on which the golf club shaft is mounted, adjustment weights providedin the head main body, a lie angle adjustment part configured to changea lie angle, and an offset adjustment part configured to change adistance between the face surface and the hosel part, wherein the headmain body includes a projecting part projecting semi-cylindrically froman upper surface, and flat parts respectively provided on both sides ofthe projecting part, and the projecting part is provided with the hoselpart and the adjustment weights are respectively provided on the flatparts.

It is preferable that an angle adjustment part configured to change aloft angle of the face surface is included.

It is preferable that the face surface part is provided detachably withrespect to the head main body, and a plurality of the face surface partsare provided for respective sizes of the loft angle, and the facesurface part corresponding to the loft angle is provided.

It is preferable that the face surface part is provided such that a soleside can be slid with respect to the head main body with a top part ofthe projecting part as a fulcrum, and the loft angle is adjusted bychanging a slide amount of the face surface part.

It is preferable that a plate-shaped part constituting part of a sole isprovided on a back face on an opposite side of the face surface of thehead main body, and in the plate-shaped part, of a region correspondingto the projecting part and regions corresponding to the flat parts, theregion corresponding to the projecting part has a thinner platethickness.

For example, the adjustment weights are fixed to the flat parts byscrews or magnets.

It is preferable that the hosel part includes a rotor provided on a rearsurface side of the face surface of the projecting part and rotatable bya predetermined angle, and a hosel provided in the rotor and configuredto fix the golf club shaft, and the rotor is fixed at the predeterminedangle to form the lie angle having a specific size.

It is preferable that a spacer can be disposed between the rotor and theprojecting part, and the distance between the face surface and the hoselpart is adjusted by a thickness of the spacer.

The invention provides a golf club including the above-described golfclub head according to the invention.

Advantageous Effects of Invention

According to the invention, it is possible to adjust a lie angle, theoffset of a striking surface, and the moment of inertia.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view illustrating a golf club according to anembodiment of the invention.

FIG. 2 is a perspective view illustrating a first example of the golfclub head of the golf club according to the embodiment of the invention.

FIG. 3 is a side view illustrating the first example of the golf clubhead of the golf club according to the embodiment of the invention.

FIG. 4 is an exploded perspective view illustrating the first example ofthe golf club head of the golf club according to the embodiment of theinvention.

FIG. 5 is a perspective view illustrating a hosel part of the firstexample of the golf club head of the golf club according to theembodiment of the invention.

FIG. 6 is a schematic view illustrating an offset adjustment in thefirst example of the golf club head of the golf club according to theembodiment of the invention.

FIG. 7 is a schematic view illustrating an offset adjustment in thefirst example of the golf club head of the golf club according to theembodiment of the invention.

FIG. 8 is a schematic view illustrating an offset adjustment in thefirst example of the golf club head of the golf club according to theembodiment of the invention.

FIG. 9 is a perspective view illustrating a second example of the golfclub head of the golf club according to the embodiment of the invention.

FIG. 10 is a side view illustrating the second example of the golf clubhead of the golf club according to the embodiment of the invention.

FIG. 11 is an exploded perspective view illustrating the second exampleof the golf club head of the golf club according to the embodiment ofthe invention.

FIG. 12 is a side view illustrating a third example of the golf clubhead of the golf club according to the embodiment of the invention.

FIG. 13 is a perspective view illustrating a fourth example of the golfclub head of the golf club according to the embodiment of the invention.

FIG. 14 is a schematic plan view illustrating a lid of the golf clubhead of the golf club according to the embodiment of the invention.

FIG. 15 is a schematic plan view illustrating the hosel part of the golfclub head of the golf club according to the embodiment of the invention.

FIG. 16 is a perspective view illustrating another example of the hoselpart of the golf club head of the golf club according to the embodimentof the invention.

FIG. 17 is a perspective view illustrating a fifth example of the golfclub head of the golf club according to the embodiment of the invention.

FIG. 18 is a side view illustrating the fifth example of the golf clubhead of the golf club according to the embodiment of the invention.

FIG. 19 is a perspective view illustrating the fifth example of the golfclub head of the golf club according to the embodiment of the inventionviewed from a sole side.

DESCRIPTION OF EMBODIMENTS

A golf club head and a golf club of the invention will be described indetail below with reference to a preferred embodiment illustrated in theaccompanying drawings.

FIG. 1 is a schematic view illustrating a golf club according to anembodiment of the invention, FIG. 2 is a perspective view illustrating afirst example of a golf club head of the golf club according to theembodiment of the invention, and FIG. 3 is a side view illustrating thefirst example of the golf club head of the golf club according to theembodiment of the invention. Note that adjustment weights 24 (see FIGS.1 and 3) are not illustrated in FIG. 2.

As illustrated in FIG. 1, a golf club 10 includes a golf club head 12and a golf club shaft 14. A grip 15 is attached to the golf club shaft14. The golf club 10 is generally referred to as a putter and is of amallet type.

In the golf club 10 illustrated in FIG. 1, the golf club head 12 isarranged with a sole 37 in contact with a horizontal surface B such thata lie angle γ becomes a set angle.

Note that the lie angle γ refers to an angle on a heel side formed by ashaft axis S of the golf club shaft 14 and the horizontal surface B.

The golf club head 12 includes a head main body 20 provided with a facesurface part 30 constituting a face surface 31, and a hosel part 22provided in the head main body 20 and on which the golf club shaft 14 ismounted.

The golf club head 12 includes the adjustment weights 24 furtherprovided on the head main body 20. In addition, the golf club head 12includes an angle adjustment part that changes a loft angle θ of theface surface 31, a lie angle adjustment part that changes the lie angleγ, and an offset adjustment part that changes the distance between theface surface 31 and the hosel part 22.

As illustrated in FIG. 2, the head main body 20 includes a projectingpart 32 projecting semi-cylindrically from an upper surface, and flatparts 34 respectively provided on both sides of the projecting part 32.The projecting part 32 is provided with the hosel part 22. A toe isformed on one of the flat parts 34 of the head main body 20 and a heelis formed on the other of the flat parts 34.

The head main body 20 and the face surface part 30 are formed of, forexample, stainless steel, copper, copper alloy, aluminum, aluminumalloy, titanium, titanium alloy, a combination of these materials, etc.

By providing the projecting part 32, the area of the face surface 31 canbe made larger. This makes it possible to widen a sweet spot and makethe center position of the sweet spot higher than the horizontal surfaceB. Thus, when striking a golf ball, it is possible to make the center ofthe golf ball and the center position of the sweet spot closer to eachother without worrying about the position of the sole 37. Accordingly,the bouncing of the struck golf ball is suppressed, the golf ball isrotated forwardly, the straight advancing ability of the golf ball whenbeing struck is improved, the directionality of the struck ball isimproved, and the direction of the struck ball can be adjusted easily.In addition, it is possible to get a good feeling of striking.

The adjustment weights 24 are provided on the respective flat parts 34(see FIGS. 1 and 3). That is, the adjustment weights 24 are provided onboth sides of the head main body 20.

Specifically, recesses 35 for installing the adjustment weights 24 areformed on flat surfaces 34 c, which are upper surfaces of the flat parts34. The adjustment weights 24 are installed in the recesses 35 and, forexample, the adjustment weights 24 are fixed by using screws. Note thatthe method for fixing the adjustment weights 24 is not particularlylimited, and if the adjustment weights 24 are magnetic substances, theadjustment weights 24 may be fixed to the recesses 35 by using magneticforce, such as by using a magnet.

The adjustment weights 24 are formed of, for example, stainless steel,copper, copper alloy, aluminum, aluminum alloy, titanium, titaniumalloy, tungsten, etc. The above-described materials are used, asappropriate, in accordance with the mass of the adjustment weights 24.In addition, the number of the adjustment weights 24 is determined, asappropriate, in accordance with the magnitude of the moment of inertiaof the golf club head 12. For example, the total mass of the adjustmentweights 24 is 60 g. In this case, each of the adjustment weights 24weighing 30 g is disposed on each of the flat parts 34.

In addition, the shape of the recesses 35 and the shape of theadjustment weights 24 are not particularly limited, and are determined,as appropriate, in accordance with the shape of the flat surfaces 34 cof the flat parts 34, etc. In addition, the shape of the adjustmentweights 24 is determined, as appropriate, in accordance with the shapeof the recesses 35, the mass of the adjustment weights 24, etc.

As illustrated in FIG. 3, in the head main body 20, a plate-shaped part38 forming part of the sole 37 is provided on a back face 31 b on theopposite side of the face surface 31 of the head main body 20. The headmain body 20 and the plate-shaped part 38 are formed integrally.

As illustrated in FIG. 4, in the plate-shaped part 38, of a region 38 acorresponding to the projecting part 32 and regions 38 b correspondingto the flat parts 34, the region 38 a corresponding to the projectingpart 32 has a thinner plate thickness. That is, the plate thickness ofthe regions 38 b corresponding to the flat parts 34 is relativelythicker. In this way, by making the regions 38 b corresponding to theflat parts 34 relatively thicker and relatively heavier, it is possibleto increase the moment of inertia of the golf club head 12 and enhancethe straight advancing ability of the golf ball when being struck. Inaddition, even if a part of the golf ball other than the center of theface surface 31 is struck, high straight advancing ability can beobtained and the directionality of the struck golf ball is excellent.

The moment of inertia refers to the moment of inertia around arotational axis that is a straight line (not illustrated) passingthrough the center of gravity (not illustrated) of the golf club head 12and orthogonal to the horizontal surface B.

As illustrated in FIG. 4, a rear surface 32 b of the projecting part 32is provided with a wall part 32 a along the periphery of the projectingpart 32. The wall part 32 a is not provided on part of the projectingpart 32 including the top part of the projecting part 32. The rearsurface 32 b of the projecting part 32 is provided with a vertical shaft33. A region 32 c surrounded by the wall part 32 a is provided with thehosel part 22. Note that the adjustment weights 24 (see FIGS. 1 and 3)are not illustrated in FIG. 4.

As illustrated in FIG. 5, the hosel part 22 includes a rotor 40 and ahosel 41 provided in the rotor 40. The hosel 41 fixes the golf clubshaft 14 and is formed of, for example, a linear cylindrical member.

The rotor 40 has a similar outer shape to that of the region 32 c (seeFIG. 4) surrounded by the wall part 32 a (see FIG. 4), and has asemi-cylindrical outer shape. The rotor 40 is provided with a hole 40 a(see FIG. 5) into which the shaft 33 (see FIG. 4) is to be inserted.

In a state in which the shaft 33 is inserted into the hole 40 a of therotor 40, the rotor 40 can be rotated around the shaft 33. The rotationof the rotor 40 is restricted by the hosel 41 being abutted against anedge 32 d (see FIG. 4) of the wall part 32 a. Note that the rotor 40 isdetachable and replaceable. The hosel 41 is provided at a position atwhich the axis (not illustrated) of the hosel 41 formed of a linearcylindrical member passes through, for example, the center of the hole40 a in a case that the hole 40 a is viewed from the face surface 31side.

By the rotor 40 being rotated, the lie angle γ (see FIG. 1) changes. Byfixing the rotor 40 in a state in which the rotor 40 is rotated by apredetermined angle, the lie angle γ having a specific size can beformed. For example, the wall part 32 a is provided such that the rotor40 can be rotated by 16°. In this case, for example, the lie angle γ canbe set to a range of 8° from 72°, i.e., the lie angle γ can be set to64° to 80°. The approximate range of the rotation amount of the rotor 40is determined by the size of the projecting part 32 (see FIG. 4).However, the rotation amount of the rotor 40 is not limited to 16°described above, and is determined, as appropriate, in accordance withthe range set for the lie angle γ, the size of the projecting part 32,etc. Because the upper limit of the lie angle γ is specified as 80° bythe rules, it is preferable that the adjustment range does not exceed80°.

The method for fixing the rotor 40 is not particularly limited and, forexample, the rotor 40 is fixed by providing a screw hole 39 (see FIG. 3)penetrating through the region 32 c (see FIG. 4) from the sole 37 (seeFIG. 3), screwing a fixing screw (not illustrated) with the screw hole39, and pushing up the rotor 40 by the fixing screw.

A lid 25 (see FIG. 3) surrounding the region 32 c with the wall part 32a is provided. With the lid 25, the rotor 40 is accommodated in theregion 32 c with a plurality of spacers 42, which will be describedlater. For example, the lid 25 is fixed to the wall part 32 a by ascrew.

The lie angle adjustment part is constituted by the hosel part 22, thewall part 32 a, the shaft 33, the fixing screw (not illustrated), etc.

The golf club can be made right-handed or left-handed by changing theposition at which the hosel 41 is attached to the rotor 40. The rotor 40is detachable as described above, and a single golf club can be easilymade right-handed or left-handed by replacing the rotor 40.

The spacers 42 illustrated in FIG. 5 can be disposed between the rotor40 and the rear surface 32 b of the projecting part 32, and an offset isadjusted in accordance with the thickness of the spacers 42. The spacers42 constitute the offset adjustment part.

As illustrated in FIG. 3, the offset refers to a distance F from a lowerend 31 c of the face surface 31 to the shaft axis S in a directionparallel to the horizontal surface B. As the offset becomes greater, thedistance from the golf club shaft 14 to the face surface 31 becomesfarther.

The outer shape of the spacers 42 is substantially the same as that ofthe rotor 40 and is, for example, a semicircle. Holes 43 into which theshaft 33 is to be inserted are provided in the spacers 42. The pluralityof spacers 42 are accommodated in the region 32 c with the rotor 40 bythe shaft 33 being inserted into the holes 43. The offset can be changedby changing the arrangement of the plurality of spacers 42. For example,the number of the spacers 42 is three, and the total thickness of thethree spacers 42 is 7 mm.

Because the spacers 42 are provided on the projecting part 32, the massnear the face surface 31 becomes greater and the moment of inertiabecomes less as the mass of the spacers 42 becomes greater. Thus, themass of the spacers 42 is preferably small. The spacers 42 are formedof, for example, aluminum, aluminum alloy, etc.

As illustrated in FIG. 5, when all of the three spacers 42 are disposedon the projecting part 32 side of the rotor 40, the offset becomesmaximum. As illustrated in FIG. 6, it is possible to dispose two of thespacers 42 on the projecting part 32 side of the rotor 40 and disposeone of the spacers 42 on the lid 25 side of the rotor 40. As illustratedin FIG. 7, it is possible to dispose one of the spacers 42 on theprojecting part 32 side of the rotor 40 and dispose two of the spacers42 on the lid 25 side of the rotor 40. As illustrated in FIG. 8, it ispossible to dispose the three spacers 42 on the lid 25 side of the rotor40. The offsets in FIG. 6, FIG. 7, and FIG. 8 become less in this order.In this way, the offset can be adjusted by changing the arrangement ofthe three spacers 42 and the rotor 40. In addition, the total thicknessis the same in any of the arrangements illustrated in FIG. 5, FIG. 6,FIG. 7, and FIG. 8 because there are the three spacers 42 and the rotor40. In this way, the offset can be adjusted.

Note that although the thickness of the spacers 42 is not particularlylimited, it is possible that each of the spacers 42 has a differentthickness, all of the spacers 42 have the same thickness, or two of thethree spacers 42 have the same thickness. In addition, the number of thespacers 42 is not limited to three, but may be one, two, or four ormore. The number of the spacers 42 can be determined, as appropriate, inaccordance with the size of the region 32 c and the size of the gapdetermined by the thickness of the rotor 40. In a configuration in whichthe three spacers 42 are used, it is possible to provide the threespacers 42 the combination of which is such that the total thickness ofthe three spacers 42 is the same, and to change the combination of thespacers 42 in accordance with the offset. In this way, the offset can bechanged more finely.

The face surface part 30 illustrated in FIG. 3 is detachably provided inthe head main body 20, and the face surface part 30 is replaceable. Aplurality of the face surface parts 30 are provided for respective sizesof the loft angle θ, and the face surface part 30 corresponding to theloft angle θ is provided.

As illustrated in FIG. 4, the face surface part 30 includes the facepart 30 a having the same shape as those of the projecting part 32 andthe flat parts 34 of the head main body 20, and bent parts 30 b providedat respective edges of the face part 30 a. Holes 30 c are provided inthe bent parts 30 b at positions aligned with screw holes 34 b formed onside surfaces 34 a of the flat parts 34. The face part 30 a is formed atan angle corresponding to the loft angle θ. The face part 30 a becomesthinner from the lower end 31 c to a top part 31 d of the face surface31.

As illustrated in FIG. 3, in the face surface part 30, by overlappingthe bent parts 30 b on the side surfaces 34 a of the flat parts 34 andaligning the holes 30 c with the screw holes 34 b, the face surface part30 is fixed to the head main body 20 by the screws 45 in a state inwhich the face surface part 30 is in contact with the end surface 20 aof the head main body 20. In this case, the loft angle θ of the facesurface 31 of the face surface part 30 becomes a predetermined angle. Asdescribed above, the loft angle θ can be changed by attaching the facesurface part 30 having a predetermined size of the loft angle θ to thehead main body 20.

The above-described face surface part 30 that is detachable and providedfor each size of the loft angle θ constitutes the angle adjustment partthat changes the loft angle θ of the face surface 31. For example, theface surface part 30 is provided at an interval of 1° within a range of0° to 7°.

Note that in a case that the loft angle θ is 0°, the face surface 31 maybe the end surface 20 a of the head main body 20.

The loft angle θ (see FIG. 3) of the golf club head 12 is measured by aknown measuring instrument such as, for example, the golf club headmeasuring platform manufactured by RISE HILL ENTERPRISE LIMITED, thegolf club angle measuring instrument manufactured by GOLFGARAGE Co.,Ltd., the golf club gage manufactured by Golfsmith InternationalHoldings Inc, etc. Note that the measuring instrument for the loft angleθ may be any known instrument and is not particularly limited in theinvention.

As described above, in the golf club 10 and the golf club head 12, eachof the lie angle γ, the loft angle θ, and the offset and the moment ofinertia of the face surface 31 (striking surface) can be adjustedindependently and individually.

The golf club head 12 is not limited to the above-described golf clubhead. Next, a second example of the golf club head will be described.

FIG. 9 is a perspective view illustrating the second example of the golfclub head of the golf club according to the embodiment of the invention,FIG. 10 is a side view illustrating the second example of the golf clubhead of the golf club according to the embodiment of the invention, FIG.11 is an exploded perspective view illustrating the second example ofthe golf club head of the golf club according to the embodiment of theinvention, and FIG. 12 is a side view illustrating a third example ofthe golf club head of the golf club according to the embodiment of theinvention.

Note that in FIGS. 9 to 12, the same reference signs will be assigned tothe same components as those of the golf club 10 illustrated in FIGS. 1to 6, and the detailed description of these components will be omitted.The adjustment weights 24 are not illustrated in FIGS. 9 and 11.

A golf club head 50 illustrated in FIGS. 9 to 11 differs from the golfclub head 12 illustrated in FIGS. 1 to 3 in the angle adjustment part,but has the same configuration except this part.

The differences are that a face surface part 60 of the golf club head 50is not replaceable, and that the sole 37 side of the face surface part60 can be moved in an opposite direction of the head main body 20 withthe top part 31 d of the face surface 31 as a fulcrum.

As illustrated in FIGS. 10 and 11, the face surface part 60 includes aface part 60 a having the same shape as those of the projecting part 32and the flat parts 34 of the head main body 20, bent parts 60 b providedat respective edges of the face part 60 a, and a bent part 60 c providedon the bottom surface of the face part 60 a. The bent parts 60 b areprovided with holes 60 d into which fixing screws 62 (see FIG. 10)screwed with the screw holes 34 b formed on the side surfaces 34 a ofthe flat parts 34 are to be inserted. The bent part 60 c is providedwith the hole 60 d into which a fixing screw (not illustrated) screwedwith a screw hole (not illustrated) formed in the sole 37 is to beinserted. The hole 60 d is a long hole and allows the movement of theface surface part 60. The hole 60 d has a length corresponding to theslide amount of the face surface part 60.

As illustrated in FIG. 10, in the face surface part 60, the bent parts60 b are overlapped on the side surfaces 34 a (see FIG. 11) of the flatparts 34 (see FIG. 11), the holes 60 d are aligned with the screw holes34 b (see FIG. 11), and the fixing screws 62 are provided in the screwholes 34 b. Also, in the bent part 60 c, the hole 60 d is aligned withthe screw hole (not illustrated) formed in the sole 37, and the fixingscrew (not illustrated) is screwed with the screw hole.

By doing this, the face surface part 60 is fixed to the head main body20 by the fixing screws 62. In this case, the loft angle θ of the facesurface 31 of the face surface part 60 becomes a predetermined angle.The loft angle θ can be changed by releasing the fixing by the fixingscrews 62, rotating the face surface part 60 with the top part 31 d as afulcrum, and fixing the face surface part 60 again by the fixing screws62. The loft angle θ of the face surface 31 of the face surface part 60can be changed, for example, within a range of 0° to 7°. In this case,the slide amount of the face surface part 60 is determined in accordancewith the range of 0° to 7° of the loft angle θ. The length of the hole60 d is determined in accordance with the range of 0° to 7° of the loftangle θ.

Also, in the golf club head 50, similarly to the golf club 10 and thegolf club head 12 described above, each of the lie angle γ, the loftangle θ, and the offset and the moment of inertia of the face surface 31(striking surface) can be adjusted independently and individually.

In the golf club head 50 illustrated in FIG. 10, when the loft angle θbecomes greater, a gap 61 occurs between the face surface part 60 andthe end surface 20 a of the head main body 20. Thus, in order to fix theface surface part 60 more firmly, similarly to the golf club head 51illustrated in FIG. 12, a shim 64 may be provided in the gap 61 betweenthe face part 60 a and the end surface 20 a of the head main body 20.Note that the golf club head 51 illustrated in FIG. 12 and the golf clubhead 50 illustrated in FIG. 10 have the same configuration except thatthe golf club head 51 is provided with the shim 64.

The shim 64 is formed of, for example, engineering plastic such as POM(polyacetal), urethane, aluminum, aluminum alloy, iron, steel, stainlesssteel, etc.

Although the golf club head 12, the golf club head 50, and the golf clubhead 51 described above are of the mallet type, there is no limitationto this type, and similarly to the golf club head 70 illustrated in FIG.13, it is possible to employ a pin type configuration in which a headmain body 72 is not provided with the plate-shaped part 38. Also, in thegolf club head 70 illustrated in FIG. 13, the adjustment of the momentof inertia by using the adjustment weights 24, the adjustment of the lieangle γ (see FIG. 1), and the adjustment of the loft angle θ (see FIG.2), and the adjustment of the offset can be performed independently andindividually. Also, in the golf club head 70 illustrated in FIG. 13, asimilar effect to those of the golf club head 12 and the golf club head50 described above can be obtained.

In the golf club head 12, the golf club head 50, the golf club head 51,and the golf club head 70 described above, similarly to the lid 25illustrated in FIG. 14, it is possible to employ a configuration inwhich lines 25 a, 25 b, and 25 c indicating specific sizes of the lieangle γ (see FIG. 1) are provided. In this case, in the hosel part 22,as illustrated in FIG. 15, the hosel 41 is provided with a line 46 foraligning with the lines 25 a, 25 b, and 25 c indicating theabove-described specific sizes of the lie angle γ. This makes itpossible to set the lie angle γ to a specific angle by aligning the line46 provided in the above-described hosel 41 with the lines 25 a, 25 b,and 25 c indicating the above-described specific sizes of the lie angleγ. For example, the line 25 a is a line indicating the lie angle γ of65°, the line 25 b is a line indicating the lie angle γ of 72°, and theline 25 c is a line indicating the lie angle γ of 77°. In addition, forexample, by setting colors for the lines 25 a, 25 b, and 25 c inadvance, the lie angle γ can be adjusted more easily.

Note that FIG. 14 is a schematic plan view illustrating the lid of thegolf club head of the golf club according to the embodiment of theinvention, and FIG. 15 is a schematic plan view illustrating the hoselpart of the golf club head of the golf club according to the embodimentof the invention.

In addition, the configuration of the hosel part 22 is not limited to aconfiguration in which the hosel 41 is formed of the linear member, andmay be the configuration illustrated in FIG. 16. Here, FIG. 16 is aperspective view illustrating another example of the hosel part of thegolf club head of the golf club according to the embodiment of theinvention.

In the hosel part 22 illustrated in FIG. 16, a hosel 47 is not linearbut is bent, and includes an attachment part 48 d to which the golf clubshaft 14 (see FIG. 1) is to be attached. The hosel 47 includes a firstmember 48 a, a second member 48 b, a third member 48 c, and theattachment part 48 d. For example, the first member 48 a is formed of acylindrical member and is connected to the rotor 40. The second member48 b is formed of a cylindrical member. The axis (not illustrated) ofthe second member 48 b is connected orthogonally to the axis (notillustrated) of the first member 48 a, and the second member 48 bprojects to the face surface 31 (see FIG. 2) side. The third member 48 cis formed of a cylindrical member, the axis (not illustrated) of thethird member 48 c is connected orthogonally to the axis (notillustrated) of the second member 48 b, and the axis (not illustrated)of the third member 48 c is parallel to the axis (not illustrated) ofthe first member 48 a. The attachment part 48 d is provided at an end ofthe third member 48 c on the side not connected to the second member 48b. The first member 48 a, the second member 48 b, and the third member48 c may be integrally formed by bending a single cylindrical member.Note that in a case that the hosel 47 is used, compared with the case ofthe above-described hosel 41, the golf club shaft 14 (see FIG. 1) isattached to a position projecting from the face surface 31. In thiscase, the offset refers to the distance F from the lower end 31 c of theface surface 31 to the shaft axis S in the direction parallel to thehorizontal surface B, as in a golf club head 80 illustrated in FIG. 18,which will be described later. The offset can be changed by changing thelength of the second member 48 b of the hosel 47.

With the configuration of the hosel 47 illustrated in FIG. 16, even if apart other than the center of the face surface 31 (see FIG. 1) is struckwhen striking a golf ball, an inclination deviation of the face surface31 hardly occurs because the face surface 31 is not on the rotationalaxis (shaft axis S (see FIG. 1)) of the golf club shaft 14 (see FIG. 1).Thus, it is possible to stably strike the golf ball.

A single golf club can be easily made right-handed or left-handed byproviding the hosel part 22 in which the attachment position of thehosel 47 to the rotor 40 has been changed. When making a single golfclub right-handed or left-handed, in a configuration in which the lid 25is provided with the lines 25 a, 25 b, and 25 c indicating the specificsizes of the lie angle γ (see FIG. 1), the provided lid 25 is such thatthe positions at which the lines 25 a, 25 b, and 25 c are provided havebeen changed for right-handed or left-handed in accordance with theposition of the hosel 47.

Although the golf club head 12, the golf club head 50, the golf clubhead 51, and the golf club head 70 described above have an adjustableloft angle, there is no limitation to this feature.

Here, FIG. 17 is a perspective view illustrating a fifth example of thegolf club head of the golf club according to the embodiment of theinvention, FIG. 18 is a side view illustrating the fifth example of thegolf club head of the golf club according to the embodiment of theinvention, and FIG. 19 is a perspective view illustrating the fifthexample of the golf club head of the golf club according to theembodiment of the invention viewed from a sole side. Note that in FIGS.17 to 19, the same reference signs will be assigned to the samecomponents as those of the golf club 10 illustrated in FIGS. 1 to 6, andthe detailed description of these components will be omitted. FIG. 19illustrates the head main body of the golf club head 80, and theadjustment weights 24 (see FIGS. 17 and 18) and the hosel 47 (see FIGS.17 and 18) are not illustrated in FIG. 19.

The golf club head 80 illustrated in FIGS. 17 to 19 differs from thegolf club head 12 illustrated in FIGS. 1 to 3 in that the loft angle θcannot be adjusted and the shape of the hosel 47 is different, but hasthe same configuration as that of the golf club head 12 illustrated inFIGS. 1 to 3 except these features.

In the golf club head 80 illustrated in FIGS. 17 to 19, for example,three adjustment weights 24 are provided on one side. The threeadjustment weights 24 are fixed by using the fixing screws 82. Notethat, as described above, the method for fixing the adjustment weights24 is not particularly limited. In addition, the number of theadjustment weights 24 is determined, as appropriate, in accordance withthe magnitude of the moment of inertia of the golf club head 80. Inaddition, the lid 25 is fixed by using the screw 84.

The golf club head 80 is such that the loft angle θ cannot be adjustedas described above and the end surface 20 a of the head main body 20forms the face surface 31. The loft angle θ of the golf club head 80 isa fixed angle and is, for example, 2°. Note that the loft angle θ is,for example, 0° to 7° and preferably 2° to 3°. Because the loft angle θof the golf club head 80 cannot be adjusted, the golf club head 80 needsto be provided for each size of the loft angle θ.

In the golf club head 80, the sole 37 is provided with screw holes 39,and the rotor 40 (see FIGS. 17 and 18) is fixed by screwing fixingscrews 86 with the screw holes 39 and pushing up the rotor 40 by thefixing screws 86.

Although the configuration of the golf club head 80 is such that thehosel 47 is used, there is no limitation to this configuration, and theabove-described hosel 41 may also be used.

With the golf club head 80, it is also possible to make the center ofthe golf ball and the center position of the sweet spot closer to eachother and get a good feeling of striking. In addition, because thebouncing of the struck golf ball is suppressed, the golf ball is rotatedforwardly, the straight advancing ability of the golf ball when beingstruck is improved, the directionality of the struck ball is improved,and the direction of the struck ball can be adjusted easily.

In addition, with the golf club head 80, the moment of inertia can beincreased, the straight advancing ability of the golf ball when beingstruck can be improved, and high straight advancing ability can beobtained even if a part other than the center of the face surface 31 isstruck.

In the golf club head 12, the golf club head 50, the golf club head 51,the golf club head 70, and the golf club head 80 described above, theface surface 31 is, for example, a smooth flat surface having metalgloss, but there is no limitation to this surface. For example, millingusing an end mill, etc. may be applied to the face surface 31. Numerousprotrusions are formed on the face surface 31 to which the milling hasbeen applied. With the face surface 31 to which the milling has beenapplied, the feeling of striking is improved by the numerousprotrusions, the friction between the face surface 31 and the golf ballis increased by the numerous protrusions, and the direction stability ofthe struck ball is improved.

By combining the golf club head 12, the golf club head 50, the golf clubhead 51, the golf club head 70, or the golf club head 80 described abovewith a thick grip 15, it is possible to stabilize the stroke whenstriking the golf ball even if the mass of the head is heavy. Note thatthe length of the golf club shaft 14 is not particularly limited, and isapproximately 32 to 35 inches.

The invention is constituted basically as described above. Above, thegolf club head and the golf club of the invention have been described;however, the invention is not limited to the embodiment described aboveand various improvements or modifications may be made within a rangewhich does not depart from the gist of the invention as a matter ofcourse.

REFERENCE SIGNS LIST

-   10 Golf club-   12, 50 Golf club head-   14 Golf club shaft-   15 Grip-   20, 72 Head main body-   22 Hosel part-   24 Adjustment weight-   25 Lid-   30 Face surface part-   30 a Face part-   30 b Bent part-   30 c Hole-   31 Face surface-   31 b Back face-   32 Projecting part-   34 Flat part-   40 Rotor-   41 Hosel-   B Horizontal surface-   F Distance-   S Shaft axis-   γ Lie angle-   θ Loft angle

1. A golf club head, comprising: a head main body including a facesurface part constituting a face surface; a hosel part provided in thehead main body and on which the golf club shaft is mounted; adjustmentweights provided in the head main body; a lie angle adjustment partconfigured to change a lie angle; and an offset adjustment partconfigured to change a distance between the face surface and the hoselpart, wherein the head main body includes a projecting part projectingsemi-cylindrically from an upper surface, and flat parts respectivelyprovided on both sides of the projecting part, the projecting part isprovided with the hosel part and the adjustment weights are respectivelyprovided on the flat parts, a rear surface of the face surface of theprojecting part is provided with a wall part along a periphery of theprojecting part, the hosel part includes a rotor provided on a rearsurface side of the face surface of the projecting part and rotatable bya predetermined angle, and a hosel provided in the rotor and configuredto fix the golf club shaft, the rotor has a similar outer shape to thatof a region surrounded by the wall part, a spacer can be disposedbetween the rotor and the projecting part, and the distance between theface surface and the hosel part is adjusted by a thickness of thespacer, a lid surrounding the region with the wall part is provided, therotor is accommodated in the region with a plurality of spacers and thelid covers the region, and the rotor is pushed up by a fixing screwscrewed with a sole and is fixed at the predetermined angle to form thelie angle having a specific size.
 2. The golf club head according toclaim 1, further comprising an angle adjustment part configured tochange a loft angle of the face surface.
 3. The golf club head accordingto claim 2, wherein the face surface part is provided detachably withrespect to the head main body, and a plurality of the face surface partsare provided for respective sizes of the loft angle, and the facesurface part corresponding to the loft angle is provided.
 4. The golfclub head according to claim 2, wherein the face surface part isprovided such that a sole side can be slid with respect to the head mainbody with a top part of the projecting part as a fulcrum, and the loftangle is adjusted by changing a slide amount of the face surface part.5. The golf club head according to claim 1, wherein a plate-shaped partconstituting part of a sole is provided on a back face on an oppositeside of the face surface of the head main body, and in the plate-shapedpart, of a region corresponding to the projecting part and regionscorresponding to the flat parts, the region corresponding to theprojecting part has a thinner plate thickness.
 6. The golf club headaccording to claim 1, wherein the adjustment weights are fixed to theflat parts by screws or magnets.
 7. (canceled)
 8. (canceled) 9.(canceled)
 10. The golf club head according to claim 1, wherein the lidis provided with a line indicating the lie angle having a specific size.11. A golf club comprising the golf club head according to claim
 1. 12.The golf club head according to claim 2, wherein a plate-shaped partconstituting part of a sole is provided on a back face on an oppositeside of the face surface of the head main body, and in the plate-shapedpart, of a region corresponding to the projecting part and regionscorresponding to the flat parts, the region corresponding to theprojecting part has a thinner plate thickness.
 13. The golf club headaccording to claim 3, wherein a plate-shaped part constituting part of asole is provided on a back face on an opposite side of the face surfaceof the head main body, and in the plate-shaped part, of a regioncorresponding to the projecting part and regions corresponding to theflat parts, the region corresponding to the projecting part has athinner plate thickness.
 14. The golf club head according to claim 4,wherein a plate-shaped part constituting part of a sole is provided on aback face on an opposite side of the face surface of the head main body,and in the plate-shaped part, of a region corresponding to theprojecting part and regions corresponding to the flat parts, the regioncorresponding to the projecting part has a thinner plate thickness. 15.The golf club head according to claim 2, wherein the adjustment weightsare fixed to the flat parts by screws or magnets.
 16. The golf club headaccording to claim 3, wherein the adjustment weights are fixed to theflat parts by screws or magnets.
 17. The golf club head according toclaim 4, wherein the adjustment weights are fixed to the flat parts byscrews or magnets.
 18. The golf club head according to claim 5, whereinthe adjustment weights are fixed to the flat parts by screws or magnets.19. The golf club head according to claim 2, wherein the lid is providedwith a line indicating the lie angle having a specific size.
 20. Thegolf club head according to claim 3, wherein the lid is provided with aline indicating the lie angle having a specific size.
 21. A golf clubcomprising the golf club head according to claim 2.